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diff --git a/engines/wintermute/system/sys_class.h b/engines/wintermute/system/sys_class.h
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+++ b/engines/wintermute/system/sys_class.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+/*
+ * This file is based on WME Lite.
+ * http://dead-code.org/redir.php?target=wmelite
+ * Copyright (c) 2011 Jan Nedoma
+ */
+
+#ifndef WINTERMUTE_SYSCLASS_H
+#define WINTERMUTE_SYSCLASS_H
+
+#include "engines/wintermute/persistent.h"
+#include "engines/wintermute/dctypes.h"
+#include "common/hashmap.h"
+#include "common/func.h"
+#include "common/stream.h"
+
+namespace Wintermute {
+class SystemInstance;
+class BaseGame;
+class BasePersistenceManager;
+class SystemClass;
+
+}
+
+namespace Common {
+template<typename T> struct Hash;
+
+template<> struct Hash<void *> : public UnaryFunction<void *, uint> {
+	uint operator()(void *val) const {
+		return (uint)((size_t)val);
+	}
+};
+
+template<> struct Hash<Wintermute::SystemInstance *> : public UnaryFunction<Wintermute::SystemInstance *, uint> {
+	uint operator()(Wintermute::SystemInstance *val) const {
+		return (uint)((size_t)val);
+	}
+};
+
+
+}
+
+namespace Wintermute {
+
+class SystemClass {
+public:
+	SystemClass(const AnsiString &name, PERSISTBUILD build, PERSISTLOAD load, bool persistentClass);
+	~SystemClass();
+
+	int getNumInstances();
+	bool removeInstance(void *instance);
+	SystemInstance *addInstance(void *instance, int id, int savedId = -1);
+	bool removeAllInstances();
+
+	int getInstanceID(void *pointer);
+	void *idToPointer(int savedID);
+
+	void setID(int id) {
+		_iD = id;
+	}
+	int getID() const {
+		return _iD;
+	}
+
+	int getSavedID() const {
+		return _savedID;
+	}
+
+	bool isPersistent() const {
+		return _persistent;
+	}
+
+	AnsiString getName() const {
+		return _name;
+	}
+
+	void saveTable(BaseGame *Game, BasePersistenceManager *PersistMgr);
+	void loadTable(BaseGame *Game, BasePersistenceManager *PersistMgr);
+
+	void saveInstances(BaseGame *Game, BasePersistenceManager *PersistMgr);
+	void loadInstance(void *instance, BasePersistenceManager *PersistMgr);
+
+	void instanceCallback(SYS_INSTANCE_CALLBACK lpCallback, void *lpData);
+
+	void resetSavedIDs();
+
+	void dump(Common::WriteStream *stream);
+
+private:
+	int _numInst;
+	bool _persistent;
+	SystemClass *_next;
+	int _iD;
+	int _savedID;
+	AnsiString _name;
+	PERSISTBUILD _build;
+	PERSISTLOAD _load;
+
+	//typedef std::set<SystemInstance *> Instances;
+	typedef Common::HashMap<SystemInstance *, SystemInstance *> Instances;
+	Instances _instances;
+
+	typedef Common::HashMap<void *, SystemInstance *> InstanceMap;
+	InstanceMap _instanceMap;
+};
+
+} // end of namespace Wintermute
+
+#endif